Cannonite

Formula:  Bi₂O(OH)₂SO₄

Origin of name:  Named for Benjamin Bartlett "Bart" Cannon, who first recognized the mineral.

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell:  a = 7.7, b = 13.839, c = 5.686, β = 109.11°

Colour:  Colourless

Diaphaneity:  Transparent

Luster:  Adamantine

Habit:  Subhedral to euhedral <200µm in aggregates <1mm

Hardness:  4

Specific gravity:  6.52

Cleavage:  None

Tenacity: Brittle

Streak:  White

Synonyms/varieties:

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